A rack upgrade that automatically keeps chemicals in the subject's body at the desired[user-controllable] level.
If there is not enough of a certain chemical in the subject's body, it will automatically inject more, provided the user has the required chemical.
This is especially useful for chemicals that wear off over time.
If a chemical and it's nul-form have effects that cancel each other out, allow the user to set a minimum and maximum level:
If the subject is below minimum level inject the chemical, if it is above maximum inject the nul-chemical, do nothing if the subject is in between.
For Nulriset, simply have a button that will automatically inject just enough Nulriset to clear out all chemicals from the subject's body.
Customer support service by UserEcho